1 by 5 x + 1 by 3 x y - 1 by 2 y , 3 by 4 y + 2 by 3 x y - 3 by 5 x ,2 by 5 x - 1 by 4 y - xy
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1
Answer:
5xy(3x+4y−7)−3y(xy−x2+9)−8
= 15x
2
y+20xy
2
−35xy−3xy
2
+3x
2
y−21y−8
= 18x
2
y+17xy
2
−35xy−27y−8 When $$x
= 2, y -1,wehave=18(2)^2 x (-1) + 17(2) (-1)^2 - 35(2) (-1) - 27(-1) - 8$$
= 18×4×(−1)+17×2×1−35×2×(−1)−27×(−1)−8
= −74+34+70+27−8
= 131−80
= 51
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